Systems, methods, and devices for interference cancellation in wireless devices

Abstract

Systems, methods, and devices perform interference cancellation operations for wireless devices. Methods include transmitting an input signal using a transmitter of a transceiver included in a wireless device, receiving an interference signal at a receiver of the transceiver, wherein the interference signal is a leakage signal, and performing interference cancellation operations on the interference signal based, at least in part, on one or more adjustments to the receiver determined based on the input signal and the received interference signal. Methods further include generating, using the transceiver, an output signal based, at least in part, on the interference cancellation operations.

What is claimed is: 
     
         1 . A method comprising:
 transmitting an input signal using a transmitter of a transceiver included in a wireless device;   receiving an interference signal at a receiver of the transceiver, wherein the interference signal is a leakage signal;   performing interference cancellation operations on the interference signal based, at least in part, on one or more adjustments to the receiver determined based on the input signal and the received interference signal; and   generating, using the transceiver, an output signal based, at least in part, on the interference cancellation operations.   
     
     
         2 . The method of  claim 1 , wherein the performing of the interference cancellation operations further comprises:
 detecting, using a receive signal strength indicator (RSSI) detector, the interference signal;   adjusting a voltage attenuator based, at least in part, on an output of the RSSI detector; and   adjusting a phase shifter based, at least in part, on an output the receiver.   
     
     
         3 . The method of  claim 2 , wherein the voltage attenuator and phase shifter are coupled between the transmitter and receiver of the transceiver. 
     
     
         4 . The method of  claim 1 , wherein the performing of the interference cancellation operations further comprises:
 adjusting a first adaptive filter based, at least in part, on the input signal and an output the receiver.   
     
     
         5 . The method of  claim 4 , wherein an output of the first adaptive filter is provided to the receiver prior to a low pass filter included in the receiver. 
     
     
         6 . The method of  claim 5 , wherein the performing of the interference cancellation operations further comprises:
 adjusting a second adaptive filter based, at least in part, on the input signal and an output the receiver.   
     
     
         7 . The method of  claim 6 , wherein an output of the second adaptive filter is provided to the receiver after the low pass filter included in the receiver. 
     
     
         8 . The method of  claim 6 , wherein the first adaptive filter and the second adaptive filter each comprise a least mean squares filter. 
     
     
         9 . The method of  claim 1 , wherein the transceiver is compatible with a wireless communications protocol, and wherein the transceiver is operating in a radar mode. 
     
     
         10 . A system comprising:
 an antenna configured to transmit and receive wireless signals;   a processing device comprising one or more processors configured to generate an input signal;   a transceiver comprising a transmitter configured to:
 transmit the input signal received from the processing device; 
   the transceiver further comprising a receiver configured to:
 receive an interference signal, wherein the interference signal is a leakage signal; 
 perform interference cancellation operations on the interference signal based, at least in part, on one or more adjustments determined based on the input signal and the received interference signal; 
 generate an output signal based, at least in part, on the interference cancellation operations; and 
   a switch configured to couple the transceiver to the antenna.   
     
     
         11 . The system of  claim 10  further comprising:
 a receive signal strength indicator (RSSI) detector configured to detect the interference signal; 
 a voltage attenuator configured to be adjusted based, at least in part, on an output of the RSSI detector; and 
 a phase shifter configured to be adjusted based, at least in part, on an output the receiver. 
 
     
     
         12 . The system of  claim 11 , wherein the voltage attenuator and phase shifter are coupled between the transmitter and receiver of the transceiver. 
     
     
         13 . The system of  claim 10  further comprising:
 a first adaptive filter configured to be adjusted based, at least in part, on the input signal and the output signal generated by the receiver. 
 
     
     
         14 . The system of  claim 13 , wherein an output of the first adaptive filter is provided to the receiver prior to a low pass filter included in the receiver. 
     
     
         15 . The system of  claim 14 , further comprising:
 a second adaptive filter configured to be adjusted based, at least in part, on the input signal and the output signal generated by the receiver, wherein an output of the second adaptive filter is provided to the receiver after the low pass filter included in the receiver.   
     
     
         16 . A device comprising:
 one or more processors configured to generate an input signal; and   a transceiver comprising:
 a transmitter configured to transmit the input signal; 
 a receiver configured to:
 receive an interference signal, wherein the interference signal is a leakage signal; 
 perform interference cancellation operations on the interference signal based, at least in part, on one or more adjustments determined based on the input signal and the received interference signal; and 
 generate an output signal based, at least in part, on the interference cancellation operations. 
 
   
     
     
         17 . The device of  claim 16  further comprising:
 a receive signal strength indicator (RSSI) detector configured to detect the interference signal; 
 a voltage attenuator configured to be adjusted based, at least in part, on an output of the RSSI detector; and 
 a phase shifter configured to be adjusted based, at least in part, on an output the receiver. 
 
     
     
         18 . The device of  claim 17 , wherein the voltage attenuator and phase shifter are coupled between the transmitter and receiver of the transceiver. 
     
     
         19 . The device of  claim 16  further comprising:
 a first adaptive filter configured to be adjusted based, at least in part, on the input signal and the output signal generated by the receiver, wherein an output of the first adaptive filter is provided to the receiver prior to a low pass filter included in the receiver. 
 
     
     
         20 . The device of  claim 19 , further comprising:
 a second adaptive filter configured to be adjusted based, at least in part, on the input signal and the output signal generated by the receiver, wherein an output of the second adaptive filter is provided to the receiver after the low pass filter included in the receiver.